<template>
    <div class="upload-file">
        <el-upload
            multiple
            :action="uploadFileUrl"
            :before-upload="handleBeforeUpload"
            :file-list="fileList"
            :limit="limit"
            :on-error="handleUploadError"
            :on-exceed="handleExceed"
            :on-success="handleUploadSuccess"
            :show-file-list="false"
            :headers="headers"
            class="upload-file-uploader"
            ref="fileUpload"
        >
            <!-- 上传按钮 -->
            <el-button size="mini" type="primary">{{ $t('components.FileUpload.index.232435-0') }}</el-button>
            <!-- 上传提示 -->
            <div class="el-upload__tip" slot="tip" v-if="showTip">
                {{ $t('components.FileUpload.index.232435-1') }}
                <template v-if="fileSize">
                    {{ $t('components.FileUpload.index.232435-2') }}
                    <b style="color: #f56c6c">{{ fileSize }}MB</b>
                </template>
                <template v-if="fileType">
                    {{ $t('components.FileUpload.index.232435-3') }}
                    <b style="color: #f56c6c">{{ fileType.join('/') }}</b>
                </template>
                {{ $t('components.FileUpload.index.232435-4') }}
            </div>
        </el-upload>

        <!-- 文件列表 -->
        <transition-group class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear" tag="ul">
            <li :key="file.url" class="el-upload-list__item ele-upload-list__item-content" v-for="(file, index) in fileList">
                <el-link :href="`${baseUrl}${file.url}`" :underline="false" target="_blank">
                    <span class="el-icon-document">{{ getFileName(file.name) }}</span>
                </el-link>
                <div class="ele-upload-list__item-content-action">
                    <el-link :underline="false" @click="handleDelete(index)" type="danger">{{ $t('components.FileUpload.index.232435-5') }}</el-link>
                </div>
            </li>
        </transition-group>
    </div>
</template>

<script>
import { getToken } from '@/utils/auth';

export default {
    name: 'FileUpload',
    props: {
        // 值
        value: [String, Object, Array],
        // 数量限制
        limit: {
            type: Number,
            default: 5,
        },
        // 大小限制(MB)
        fileSize: {
            type: Number,
            default: 5,
        },
        // 文件类型, 例如['png', 'jpg', 'jpeg']
        fileType: {
            type: Array,
            default: () => ['doc', 'xlsx', 'xls', 'ppt', 'txt', 'pdf'],
        },
        // 是否显示提示
        isShowTip: {
            type: Boolean,
            default: true,
        },
        uploadFileUrl: {
            type: String,
            default: process.env.VUE_APP_BASE_API + '/iot/tool/upload',
        },
    },
    data() {
        return {
            number: 0,
            uploadList: [],
            baseUrl: process.env.VUE_APP_BASE_API,
            headers: {
                Authorization: 'Bearer ' + getToken(),
            },
            fileList: [],
        };
    },
    watch: {
        value: {
            handler(val) {
                if (val) {
                    let temp = 1;
                    // 首先将值转为数组
                    const list = Array.isArray(val) ? val : this.value.split(',');
                    // 然后将数组转为对象数组
                    this.fileList = list.map((item) => {
                        if (typeof item === 'string') {
                            item = { name: item, url: item };
                        }
                        item.uid = item.uid || new Date().getTime() + temp++;
                        return item;
                    });
                } else {
                    this.fileList = [];
                    return [];
                }
            },
            deep: true,
            immediate: true,
        },
    },
    computed: {
        // 是否显示提示
        showTip() {
            return this.isShowTip && (this.fileType || this.fileSize);
        },
    },
    methods: {
        // 上传前校检格式和大小
        handleBeforeUpload(file) {
            // 校检文件类型
            if (this.fileType) {
                const fileName = file.name.split('.');
                const fileExt = fileName[fileName.length - 1];
                const isTypeOk = this.fileType.indexOf(fileExt) >= 0;
                if (!isTypeOk) {
                    this.$modal.msgError(this.$t('components.FileUpload.index.232435-6') + this.fileType.join('/') + this.$t('components.FileUpload.index.232435-7'));
                    return false;
                }
            }
            // 校检文件大小
            if (this.fileSize) {
                const isLt = file.size / 1024 / 1024 < this.fileSize;
                if (!isLt) {
                    this.$modal.msgError(this.$t('components.FileUpload.index.232435-8') + `${this.fileSize} MB!`);
                    return false;
                }
            }
            this.$modal.loading(this.$t('components.FileUpload.index.232435-9'));
            this.number++;
            return true;
        },
        // 文件个数超出
        handleExceed() {
            this.$modal.msgError(this.$t('components.FileUpload.index.232435-10') + `${this.limit} 个!`);
        },
        // 上传失败
        handleUploadError(err) {
            this.$modal.msgError(this.$t('components.FileUpload.index.232435-11'));
            this.$modal.closeLoading();
        },
        // 上传成功回调
        handleUploadSuccess(res, file) {
            if (res.code === 200) {
                this.uploadList.push({ name: res.fileName, url: res.fileName });
                this.uploadedSuccessfully();
            } else {
                this.number--;
                this.$modal.closeLoading();
                this.$modal.msgError('上传文件失败，请检查相关配置');
                console.log(res.msg);
                this.$refs.fileUpload.handleRemove(file);
                this.uploadedSuccessfully();
            }
        },
        // 删除文件
        handleDelete(index) {
            this.fileList.splice(index, 1);
            this.$emit('input', this.listToString(this.fileList));
        },
        // 上传结束处理
        uploadedSuccessfully() {
            if (this.number > 0 && this.uploadList.length === this.number) {
                this.fileList = this.fileList.concat(this.uploadList);
                this.uploadList = [];
                this.number = 0;
                this.$emit('input', this.listToString(this.fileList));
                this.$modal.closeLoading();
            }
        },
        // 获取文件名称
        getFileName(name) {
            if (name.lastIndexOf('/') > -1) {
                return name.slice(name.lastIndexOf('/') + 1);
            } else {
                return '';
            }
        },
        // 对象转成指定字符串分隔
        listToString(list, separator) {
            let strs = '';
            separator = separator || ',';
            for (let i in list) {
                strs += list[i].url + separator;
            }
            return strs != '' ? strs.substr(0, strs.length - 1) : '';
        },
    },
};
</script>

<style scoped lang="scss">
.upload-file-uploader {
    margin-bottom: 5px;
}

.upload-file-list .el-upload-list__item {
    border: 1px solid #e4e7ed;
    line-height: 2;
    margin-bottom: 10px;
    position: relative;
}

.upload-file-list .ele-upload-list__item-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: inherit;
}

.ele-upload-list__item-content-action .el-link {
    margin-right: 10px;
}
</style>
